proponent vs doer

proponent and doer both are nouns.

Word	Noun	Adjective	Verb	Adverb
proponent	Yes	No	No	No
doer	Yes	No	No	No

As nouns, doer is a hypernym of proponent; that is, doer is a word with a broader meaning than proponent:

Other hypernyms of proponent include actor, worker.

proponent (noun)	doer (noun)
a person who pleads for a cause or propounds an idea	a person who acts and gets things done